Moire photography in engineering measurement
By installing a slotted mask inside a camera lens its response can be tuned to resolve 300 lines/mm over the whole image field. The camera is used to record fine grid patterns applied to engineering structures and deformations are revealed as moiré fringes generated by changes in the pattern. The technique has been applied to large civil engineering structures as well as small components and automatic pattern analysis offers improved accuracy and speed.
KeywordsMoire Fringe Road Research Laboratory Local Strain Distribution Orthogonal Diffraction Grating Large Engineering Structure
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